<template>
  <div class="item"></div>
</template>

<script>
export default {
  data() {},
  methods: {},
};
</script>

<style scoped>
.item {
  position: fixed;
  left: 30%;
  bottom: 0px;
  width: 100px;
  height: 100px;
  border: 1px solid blue;
  background: red;
}
</style>